QuickBooks Error 99001
Free Step-By-Step Fix Guide
QuickBooks Error 99001 appears when access to the company file is completely blocked. This usually happens alongside Error 6073 and indicates that another user or process has an exclusive lock on the company file preventing anyone else from opening it. It can also appear when the QuickBooks database service has crashed or stopped unexpectedly.
Before You Start — Try This First
- Ask all users if they have the company file open anywhere
- Check if QuickBooks is running on any other computer on the network
- Have administrator access ready
- Check if the server computer is running normally
Step-by-Step Fix
Close QuickBooks Everywhere
Ask every user on your network to fully close QuickBooks → File → Exit QuickBooks → Wait 3 minutes for all connections to fully close → Try opening again
Check Task Manager on Server
On your server computer: Ctrl + Alt + Delete → Task Manager → Processes tab → Look for: QBW32.exe or QuickBooks processes → Right click → End Task → Wait 1 minute → Try opening again
Delete .ND and .TLG Files
Navigate to company file folder: Delete: CompanyName.QBW.ND. Delete: CompanyName.QBW.TLG. These files recreate automatically. Try opening company file again
Restart QuickBooks Services
Press Windows + R → services.msc → Find QuickBooksDBXX → Right click → Restart → Wait 30 seconds → Find QBCFMonitorService → Right click → Restart → Try opening again
Restart Server Computer
If QuickBooks services won't restart: Restart the entire server computer → Wait for full boot up → Open QuickBooks on server first → Then open on workstations
Run QuickBooks File Doctor
QuickBooks Tool Hub → Company File Issues → Run QuickBooks File Doctor → Select your company file → Check both file and network → Full scan
Check Folder Permissions
Right click company file folder → Properties → Security → Make sure QBDataServiceUserXX has Full Control → If not add it → Apply → Try opening again
Did these steps fix your error?
Yes
Make sure users always properly close QuickBooks rather than just closing the window to prevent exclusive locks recurring.
No
Error 99001 that persists after all users have closed QuickBooks and services have been restarted usually means a deeper file lock or database service issue.
Still Getting Error 99001?
Persistent file access blocks after closing all users and restarting services usually mean a deeper database or server configuration issue. Our accounting experts diagnose and clear company file locks fast — get your team back in today.
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